Secunia Advisory: SA14820

Critical: Moderately critical

Impact: Exposure of system information, Exposure of sensitive information

Where: From remote

Solution Status: Unpatched

Software: Mozilla Firefox 0.x, Mozilla Firefox 1.x

A vulnerability has been discovered in Mozilla Firefox, which can be exploited by malicious people to gain knowledge of potentially sensitive information.

The vulnerability is caused due to an error in the JavaScript engine, as a “lambda” replace exposes arbitrary amounts of heap memory after the end of a JavaScript string.

Successful exploitation may disclose sensitive information in memory.

Secunia has constructed a test, which can be used to check if your browser is affected by this issue:
http://secunia.com/mozilla_products_arbitrary_memory_exposure_test/

The vulnerability has been confirmed in versions 1.0.1 and 1.0.2. Other versions may also be affected.

Solution:
Disable JavaScript support.

[Continue reading Mozilla Firefox JavaScript Engine Information Disclosure Vulnerability]